linux-kernel - Re: [PATCH v3 16/16] objtool,x86: Rewrite retpoline thunk calls

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Message-Id: <20210604205018.2238778-1-ndesaulniers@google.com>
Date:   Fri,  4 Jun 2021 13:50:18 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     peterz@...radead.org
Cc:     jpoimboe@...hat.com, lma@...ihalf.com, groeck@...gle.com,
        jgross@...e.com, lb@...ihalf.com, linux-kernel@...r.kernel.org,
        mbenes@...e.com, rad@...ihalf.com, upstream@...ihalf.com,
        x86@...nel.org, clang-built-linux@...glegroups.com,
        nathan@...nel.org
Subject: Re: [PATCH v3 16/16] objtool,x86: Rewrite retpoline thunk calls

(Manually replying to https://lore.kernel.org/lkml/CAFJ_xbq06nfaEWtVNLtg7XCJrQeQ9wCs4Zsoi5Y_HP3Dx0iTRA@mail.gmail.com/)

Hi Peter,
We're also tracking 2 recent regressions that look like they've come from this
patch.

https://github.com/ClangBuiltLinux/linux/issues/1384
https://github.com/ClangBuiltLinux/linux/issues/1388

(Both in linux-next at the moment).

The first, it looks like a boot failure. The second is a warning from the
linker on a kernel module; even readelf seems unhappy with the results of the
output from objtool.

I can more easily reproduce the latter, so I'm working on getting a smaller
reproducer. I'll let you know when I have it, but wanted to report it ASAP.